They said Alcatraz was escape-proof, but 50 years ago yesterday, three prisoners made an ingenious break out, paddled out into the cold waters of San Francisco Bay and disappeared.

On June 11, 1962, Frank Morris and brothers Clarence and John Anglin were ready to bust out of prison. Over the past year they had patiently chipped away at the air vents in their respective cells with spoons. At night they’d replace the vents and cover the expanding tunnels with pieces of colored cardboard.

On the night of the breakout they squirmed through the tunnels into an unused service corridor and made their way to the roof. To keep the guards from noticing they were gone, they left behind dummy heads in their beds made of paper maché and real hair gathered from the prison barbershop.

From the roof they climbed the barbed wire fence and floated away on a raft made of rubber raincoats. They were never seen again. Fragments of their raft and plywood paddles were found on Angel Island, two miles away from Alcatraz. Footprints led away from the raft and a car was stolen that night.

A fourth man, Allen West, didn’t make it to the rendezvous in time and was left behind.

Did the three men escape? Despite many rumors, none of them were ever found. A ship’s captain said he spotted a body floating in the bay wearing a prison uniform. The body wasn’t recovered. Their files remain open.

Alcatraz, also known as “The Rock,” started life as a fort. During the Civil War, local Confederate sympathizers and privateers were imprisoned there. It continued as a military prison through World War I, when it housed conscientious objectors. Alcatraz became a Federal prison in 1933 and was used to keep the most troublesome prisoners. Its guests included such model citizens as Al Capone and “Machine Gun” Kelly. It was closed in 1963.

Now Alcatraz is a National Park and open to the public. Visitors can see the prisoners’ cells and other areas, as well as the escape route of Morris and the Anglin brothers. All access to the island is via the private ferry company Alcatraz Cruises from Pier 33. Check out the gallery for some views of the prison, as well an intriguing shots of the escape route.